After gleaning in Boaz's field until evening, how much barley did Ruth beat out?

Answer: About an ephah

Ruth gathered grain in the field until evening, beat out what she had gleaned, and it was about an ephah of barley (Ruth 2:17).

“So Ruth gathered grain in the field until evening. And when she beat out what she had gleaned, it was about an ephah of barley.”— Ruth 2:17 (BSB)